Welcome to the NEW Infrared Training Forum. To view the old message board, please click here.World Class Infrared Training for Thermography Professionals


Post Reply 
 
Thread Rating:
  • 0 Votes - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Colorization, emissivity and auto calibrator
05-27-2014, 03:58 PM (This post was last modified: 05-27-2014 04:12 PM by acardoso.)
Post: #1
Colorization, emissivity and auto calibrator
Why our SC660, having the last firmware version 11.5.3, change the colorization of thermogram, when we change the emissivity?

Why the auto calibrator stops working?


Attached File(s) Thumbnail(s)
   

.zip  IR_0409.zip (Size: 381.34 KB / Downloads: 9)
Find all posts by this user
Quote this message in a reply
05-27-2014, 07:23 PM
Post: #2
RE: Colorization, emissivity and auto calibrator
(05-27-2014 03:58 PM)acardoso Wrote:  Why our SC660, having the last firmware version 11.5.3, change the colorization of thermogram, when we change the emissivity?

Why the auto calibrator stops working?



This should be posted on the customer support site http://support.flir.com
Find all posts by this user
Quote this message in a reply
05-29-2014, 03:28 PM (This post was last modified: 05-29-2014 03:30 PM by acardoso.)
Post: #3
RE: Colorization, emissivity and auto calibrator
Dear Bob,

I reported this same problem for the 1st time on January 28th of 2012 at FLIR Tools 2.0. Besides not being solved at FLIR Tools 4.1, it had propagated to the cameras firmware.
Find all posts by this user
Quote this message in a reply
05-30-2014, 09:16 AM
Post: #4
RE: Colorization, emissivity and auto calibrator
If the T scales are fixed, then changing the emissivity would change the perceived Ts. That then SHOULD change the colorization. I am assuming that by "change the colorization" you mean that a location that was red becomes green, and so on.
Jack

Jack M. Kleinfeld, P.E.
Kleinfeld Technical Services, Inc.
Infrared Thermography, Finite Element Analysis, Process Engineering



Bronx, NY 10463


come see what we can do for you: http://www.KleinfeldTechnical.com
YouTube channel: http://www.youtube.com/KleinfeldTechnical
[font=tahoma][/font]
Find all posts by this user
Quote this message in a reply
05-30-2014, 09:45 AM (This post was last modified: 05-30-2014 09:46 AM by acardoso.)
Post: #5
RE: Colorization, emissivity and auto calibrator
Dear Jack,

A thermogram is a map of radiation, not a map of temperatures. When we change emissivity, we are only the translation of the intensity of radiation into a temperature. The image in false color has to stay intact, independently of the setting of color scale, manual or auto.
Find all posts by this user
Quote this message in a reply
05-30-2014, 10:56 PM (This post was last modified: 05-30-2014 10:58 PM by JKEngineer.)
Post: #6
RE: Colorization, emissivity and auto calibrator
Antonio,

Perhaps we need to go back to my comment about not being sure what you mean by change in colorization. I looked at the image you attached, but do not understand its significance. Perhaps you should provide two images of the same object with two different emissivities entered.

In addition, while the physics is that we are seeing radiation, the presentation in the camera is of calculated temperature, not of radiation. If the object's emissivity is changed with no other changes made, then the calculated temperature of the object changes. If the camera is set to display black for T1 and white for T2 (using grayscale), then the object temperature if at say the average of T1 and T2 would be 50% gray. With a different emissivity (for the object) the temperature is no longer the average of T1 and T2 so it's no longer at 50% gray.

The above assumes that the Tscale in the image is fixed as the emissivity changes. If the radiation received scale is, in fact, what is fixed, then as the emissivity is changed the numerical values for T1 and T2 would change, but still be black and white. Then the color / gray scale for the object should also not change.

Either scenario would make sense as a way to set up the display. Which one do you have?

Jack
Find all posts by this user
Quote this message in a reply
Post Reply 


Forum Jump:


User(s) browsing this thread: 1 Guest(s)
Copyright © 1999-2012 FLIR Systems, Inc.